 Matrices
3 years ago
mkrein
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Practice 14 QuestionsShow answers
• Question 1
300 seconds 11    8
-4     2
3     2
-6    -6
-3    2
-4    -6
10    8
-6    2
• Question 2
300 seconds Q. Subtract
3    -8
0   -1
3   -4
8  -13
-3   8
0    1
3   -8
-8    1
• Question 3
300 seconds Q. Find A+B
8     10
8      1
12     25
7     1
10     30
0     1
can't add two together because the rows dont match columns
• Question 4
300 seconds Q. What do w, x, y and z equal in this matrix subtraction?
w = 13, x = 4, y = 7, z = 23
w = 13, x = -4, y = 11, z = 23
w = 13, x = 4, y = 11, z = 23
w = 13, x = 4, y = 11, z = 17
• Question 5
300 seconds Q. What do m, n, p and q equal in this scalar matrix multiplication?
m=8, n=9, p=-4, q=4
m=15, n = -45, p=20, q=-5
m=20, n=-5, p=15, q=-45
m=-5, n=20, p=-45, q=15
• Question 6
60 seconds Q. What are the dimensions of this matrix?
2 x 3
3 x 2
6 x 1
1 x 6
• Question 7
300 seconds Q. Perform the indicated operation.  If it’s not possible, select Not Possible.
7
-7
-6
20

-9
-6
20
Not Possible
7
-9
2
20
• Question 8
900 seconds Q. find: B*A
47     30
9     5
17     15
42     35
10     25
7     1
not possible because rows do not match columns
• Question 9
900 seconds Q. Multiply
20     15    -10
30     -5         0
-20      15     -10
30     -5          0
1        8       3
11     4        5
20     -15     10
-30         5        0
• Question 10
180 seconds Q. Subtract
-5
-8
3
10
-9
8
3
2
5
-8
3
10
-5
8
3
2
• Question 11
60 seconds Q. In Matrix R (pictured) what element is in the second row, third column?
8
9.01
6
1
• Question 12
30 seconds
Q. What comes first in the order?
Row
Column
• Question 13
30 seconds
Q. What must be true in order to ADD two matrices?
They must be square.
The dimensions must be equal.
The determinant can't equal 0.
The column of the 1st must equal the row of the 2nd.
• Question 14
30 seconds
Q. You can multiply a 2X3 matrix by which matrix?